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CDCE421 Datasheet(PDF) 3 Page - Texas Instruments |
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CDCE421 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 24 page DEVICE SETUP AND CONFIGURATION CDCE421 www.ti.com..................................................................................................................................................... SCAS842B – APRIL 2007 – REVISED JANUARY 2009 Table 1. Crystal Frequency Selection and Device Settings REQUIRED INPUT DESIRED OUTPUT CRYSTAL VCO OUTPUT PRESCALER FEEDBACK FREQUENCY (MHz) FREQUENCY (MHz) SELECTION DIVIDER SETTING DIVIDER(1) From To From To 1020.0 1175.0 31.875 36.719 VCO 2 1 2 32 875.2 (2) 1020.0 27.351 31.875 VCO 1 1 2 32 650.0 766.7 (2) 32.500 38.333 VCO 2 1 3 20 583.5 650.0 29.174 32.500 VCO 1 1 3 20 510.0 587.5 31.875 36.719 VCO 2 1 4 16 437.6 510.0 27.351 31.875 VCO 1 1 4 16 408.0 460.0 34.000 38.333 VCO 2 1 5 12 350.1 408.0 29.174 34.000 VCO 1 1 5 12 340.0 383.3 34.000 38.333 VCO 2 2 3 20 291.7 340.0 29.174 34.000 VCO 1 2 3 20 255.0 293.8 31.875 36.719 VCO 2 2 4 16 218.8 255.0 27.351 31.875 VCO 1 2 4 16 204.0 230.0 34.000 38.333 VCO 2 2 5 12 175.0 204.0 29.174 34.000 VCO 1 2 5 12 170.0 191.7 34.000 38.333 VCO 2 4 3 20 145.9 170.0 29.174 34.000 VCO 1 4 3 20 127.5 146.9 31.875 36.719 VCO 2 4 4 16 109.4 127.5 27.351 31.875 VCO 1 4 4 16 102.0 115.0 34.000 38.333 VCO 2 4 5 12 87.5 102.0 29.174 34.000 VCO 1 4 5 12 85.0 95.8 34.000 38.333 VCO 2 8 3 20 72.9 85.0 29.174 34.000 VCO 1 8 3 20 63.8 73.4 31.875 36.719 VCO 2 8 4 16 54.7 63.8 27.351 31.875 VCO 1 8 4 16 51.0 57.5 34.000 38.333 VCO 2 8 5 12 43.8 51.0 29.174 34.000 VCO 1 8 5 12 42.5 47.9 34.000 38.333 VCO 2 16 3 20 36.5 42.5 29.174 34.000 VCO 1 16 3 20 31.9 36.7 31.875 36.719 VCO 2 16 4 16 27.4 31.9 27.351 31.875 VCO 1 16 4 16 25.5 28.8 34.000 38.333 VCO 2 16 5 12 21.9 25.5 29.174 34.000 VCO 1 16 5 12 21.3 24.0 34.000 38.333 VCO 2 32 3 20 18.2 21.3 29.174 34.000 VCO 1 32 3 20 15.9 18.4 31.875 36.719 VCO 2 32 4 16 13.7 15.9 27.351 31.875 VCO 1 32 4 16 12.8 14.4 34.000 38.333 VCO 2 32 5 12 10.9 12.8 29.174 34.000 VCO 1 32 5 12 (1) The feedback divider is set automatically with respect to the prescaler setting. (2) Discontinuity in frequency range. Copyright © 2007–2009, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): CDCE421 |
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